Q: - What is Authentication Header and how it provides the protection to IP header?
Basically Authentication Header protects IP header and provides the complete authenticity to the IP packets.AH may work in two ways: transport mode and tunnel mode.
In tunnel mode; Authentication Header protects the IP header using two IP header layers inner and outer. The inner IP header is used to contain the source and destination addresses, and the outer IP header is used to contain the security gateway information.
Q: - if We have to generate a hash function then what characteristics are needed in a secure hash function?.
Basically Authentication Header protects IP header and provides the complete authenticity to the IP packets.AH may work in two ways: transport mode and tunnel mode.
In tunnel mode; Authentication Header protects the IP header using two IP header layers inner and outer. The inner IP header is used to contain the source and destination addresses, and the outer IP header is used to contain the security gateway information.
Q: - if We have to generate a hash function then what characteristics are needed in a secure hash function?.
- A secure hash function should have the following characteristics:
- The output generated by a hash function should be of a fixed length.
- It should be very easy to find out a hash function for a given message.
- If a hash value is given of a message than it is almost impossible to get that message.
- The two different messages should not have the same hash value; it is against the hash function property.
For authentication: One can encrypt the hash (MD4/SHA) of the data with a private key. This is known as a digital signature.
To prevent DoS attacks firewall can be configured as a relay; in this approach the firewall responds on behalf of the internal host. During the attack, the firewall responds to the SYN sent by the attacker; since the ACK never arrives, the firewall terminates the connection. By Keeping protocols and Antivirus software up-to-date, we can prevent being a victim of DoS. A regular scanning of the machine is also necessary in order to detect any anomalous behavior.
Q: - What are the differences among encoding, encryption and hashing?
Encoding: Basically encoding is used to protect the integrity of data as it crosses through a communication network to keep its original message upon arriving. It is primarily an insecure function because it is easily reversible.
Encryption: Encryption is basically designed for confidentiality and data integrity and reversible only if you have the appropriate key.
Hashing: With hashing the operation is one-way i.e. non-reversible. It takes an input (or , message ) and returns a fixed-size string, which is called the hash value.
Q: - What is Data encryption?
Data encryption ensures data safety and very important for confidential or critical data. It protects data from being read, altered or forged while transmission.
Q: - What is Digital Signatures ?
A digital signature is an attachment to an electronic message used for security purpose. It is used to verify the authenticity of the sender.
Q: - How do you use RSA for both authentication and secrecy?
RSA is a public key encryption algorithm. The RSA algorithms are based on the mathematical part that it is easy to find and multiply large prime numbers together, but it is extremely difficult to factor their product.
Q: - If you are a victim of Denial of Service (Dos) then what you do?
The function of a denial of service attack is to flood its target machine with too much traffic and prevents it from being accessible to any other requests or providing services.
To prevent DoS attacks firewall can be configured as a relay; in this approach the firewall responds on behalf of the internal host. During the attack, the firewall responds to the SYN sent by the attacker; since the ACK never arrives, the firewall terminates the connection. By Keeping protocols and Antivirus software up-to-date, we can prevent being a victim of DoS. A regular scanning of the machine is also necessary in order to detect any anomalous behavior.
Q: - What are the differences among encoding, encryption and hashing?
Encoding: Basically encoding is used to protect the integrity of data as it crosses through a communication network to keep its original message upon arriving. It is primarily an insecure function because it is easily reversible.
Encryption: Encryption is basically designed for confidentiality and data integrity and reversible only if you have the appropriate key.
Hashing: With hashing the operation is one-way i.e. non-reversible. It takes an input (or , message ) and returns a fixed-size string, which is called the hash value.
Q: - What is Data encryption?
Data encryption ensures data safety and very important for confidential or critical data. It protects data from being read, altered or forged while transmission.
Q: - What is Digital Signatures ?
A digital signature is an attachment to an electronic message used for security purpose. It is used to verify the authenticity of the sender.
Q: - How do you use RSA for both authentication and secrecy?
RSA is a public key encryption algorithm. The RSA algorithms are based on the mathematical part that it is easy to find and multiply large prime numbers together, but it is extremely difficult to factor their product.
Q: - If you are a victim of Denial of Service (Dos) then what you do?
The function of a denial of service attack is to flood its target machine with too much traffic and prevents it from being accessible to any other requests or providing services.
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